So I had no yellow. AT ALL. I tried the flushing procedures as instructed here on inkjet mall. Multiple regular cleanings, multiple power cleanings. Nothing.
I purchased the piezo flush kit with the 9 carts from here. Soaked the head for 3 hours over a bounty towel, did more power flushes. Still no yellow. All the other lines were working perfectly (a faint pink color since the piezo flush is pink and all the ink was purged from the lines.) More regular cleanings. Let the head sit over a piezoflush moistened towel again for hours. More power cleanings. Nozzle check shows complete absence of yellow. Maintenance cartridge is full of piezo flush so I had to get a new one.
I took the printer apart as per the service manual. I accessed the dampers. I cleaned them with piezo flush. I cleaned the little spikey things that go into the dampers. I put a paper towel under the head and gently aspirated the spikey thing that goes into the yellow damper. I got out yellow crud. I flushed the little spikey thing gently back and forth. The towel underneath eventually only showed piezo flush.
I reassembled the printer. I did a power clean. I did a nozzle test. I got the yellow channel back although some nozzles were absent in the yellow as well as a couple of other channels. The printer seemed to be recovering! I was psyched.
I turned the printer off. Then I turned it back on. I got a ‘no maintenance cartridge’ error on the LCD. I pulled out the cartridge thinking it wasnt seated well. There was a little cloud of smoke in the center part of the cartridge - smelled like something shorted? There was no smoke coming off the print head or out of anywhere else - just a little cloud sitting in the middle of the maintenance cartridge where the waste ink gets squirted. I looked inside but there was no liquid dripping or anything. I put in a NEW OEM maintenance cartridge. I get the notice that the maintenance cover is open. I close the cover. Then I get a brief error that there are no ink cartridges. Then it says there is no maintenance cartridge. Turning the printer off and on and repeating the cartridge change I STILL get the same sequence of errors.
I also have a cartridge that is full and was giving me a cartridge full error a couple of days ago (All those power cleanings filled it up with piezo flush coming out of the other 7 color lines). I put the old cartridge in. Instead of a cartridge full error, I get the same ‘no maintenance cartridge error’. I clean the chip on the new maintenance cartridge with alcohol, let it dry and reinserted it. Still the same sequence of errors.
So what happened?